| Saint-Martin-en-Gâtinois | |
| Commune Status: | Commune |
| Insee: | 71457 |
| Postal Code: | 71350 |
| Arrondissement: | Chalon-sur-Saône |
| Canton: | Gergy |
| Coordinates: | 46.9436°N 5.0161°W |
| Elevation M: | 190 |
| Elevation Min M: | 175 |
| Elevation Max M: | 200 |
| Area Km2: | 7.29 |
Saint-Martin-en-Gâtinois is a commune in the Saône-et-Loire department in the region of Bourgogne-Franche-Comté in eastern France.